Your original type seats use a simple pair of heat pads, one in the seat's cushion, one in the seat back.

Your "new" seats have a completely different heat/cool system, which runs through a small module under the right front seat, with the hot/cold selections chosen from the respective selector switch housed in the center dash area immediately below the facia vent.

There is an upper and lower standalone Peltier loop and small fan connected to a curved duct to flow the selected warm/cool air into the seat cushion through a centrally located vent. The seat cushion heat/cool duct can be easily identified if you tip the seat backwards. FWIW, a very common failing of the heat side/Peltier loop is due to the plastic duct fracturing and overheating the Peltier loop, which then shuts off and the small fan quits blowing.

Although the actual seat switches appear very similar between the old and new seats (although your "new" seats will have more external selector buttons, including adjustable headrests) the later switch circuits work in an entirely different way.

The later seats have individual seat modules mounted above the plastic trim held to the seat base by four T30 screws. The seat's memory selections are stored in these modules.

What model year is your L322?

Rob

 

@anvilrob Thanks for the quick reply. I am aware of all of this. But everything you are stating are contained in the 3 main connectors I've already mentioned (that even the old seats had, but with many pins unpopulated/unused). According to wiring diagrams, the climatic seats don't need any additional incoming electrical harnesses. (expect for ones equipped with rear seat entertainment - but that's a separate connector all together)

Its a MY2010-2012 L322 as stated above (there are no changes with respect to climatic seating or rear seat entertainment within these model years).

1. The 22 position connector (referred to in wiring diagrams as C2947/C3041) contains all the seat motor information (including blower motors).

2. Heating elements are connected by C0752/C0255 which is the 12 pin connector with heavy wires.

3. C2378/C2379 (4pin) are the passenger side airbag and belt tension connectors.

4. which leaves two connectors (C2952/C3110) is the rear seat entertainment LCD module

5. and the other is the "mystery 14p" connector?!?!??

The climate control module (D243) I know is different between climatic seat models and simply heated seat modules (it has an extra two knobs on it below vehicle temperature controls to independently control each seat temperature). I already replaced this with the correct version. Furthermore, I already installed the seat climate drive module under passenger seat to drive the blower motors (This is connected by C3140/C3141/C3142 in the wiring diagrams). I also updated the Car config file to change expected climate control settings from heated to climatic seats and also memory passenger seating to allow on demand self test and seat calibration through SDD.

As far as modules go, the main difference is the passenger seat uses a memory module which basically replaces the high current switch pack in the older seats with a box that has a bunch of relays and motors have position sensors (since it is memory seats). It's also on the CanBus now (PSM - Passsenger seat module), and endpoints can be calibrated through SDD.

Also I believe the Peltier is only used for cooling, the heating uses conventional resistive elements?

It still doesn't answer my question about the mystery connector mentioned above.... Do you have any information about this connector?
I also updated the Car config file to change expected climate control settings from heated to climatic seats as well as enable memory seating on passenger side so it will allow on demand self test and seat calibration through SDD

 

And just for reference, here is the old D243 climate control module next to the one I upgraded it to for full climatic seating. Can anyone help out with the “Mystery 14p” connector????

 

FWIW, I re-read your original post several times in an attempt to identify the model year. While you do make mention of the "new" seats coming from a later model maybe you could point out where your actual MY on your car is stated?

I asked the question because, not having a clear understanding of the CAN-BUS platform you're working with, and that the oblique picture you provided (with the clipped off upper B-post which is where the MY2010-12 have side the airbag badges) and the lowly lit C-post your picture could just have easily been from any MY2008 onwards.

If I missed it I apologize.

Anyway, that connector is plugged into a connector from the body harness which contains the following 1-14 pin colors:

Pin 1 Purple/orange
Pin 2 Yellow/purple
Pin 3 Gray/orange
Pin 7 Gray/brown
Pin 12 Red

Pins 4,5,6,8,9,10,11,13 and 14 are empty
Best of luck with this project.

BTW, the Peltier provides HEAT. The cooling is merely boosted ambient cabin air which LR presumes is already "cooled" sufficiently from the existing cabin HVAC being selected towards a cooled AC temperature.

Rob

 

@anvilrob yes there, thanks for the follow up and the info! I’m so stumped by this because it does not appear to be in the factory wiring diagrams.

the vehicle these seats came from was 2011 or 2012, the one they are going into is a 2010. You are correct, I didn’t clearly state which vehicle they were going into (I apologize if I didn’t make this clear). I tried to pick from same model years so it would be a hopefully relatively easy retrofit. (Body harnesses should be the same between my10-my12, but they had a few different versions depending on options)

I can verify the vehicle they came out of had this harness present and connected. I’m attaching some detailed pics of both sides of the connector on the seat side so you can see which pins are populated. The two heavy wires on ends are blue and white and appear to be connected to each other. This connector appears to be related to seat motorization.

any more help you can provide figuring this out would be greatly appreciated!

 

@anvilrob

I was completely unaware that it used Peltier for heat, I thought it used same resistance heater wire sewn into seat covers as the normal heated seats. Does the heater work as well as standard heater seats? (I was always very happy with performance of those)

here is the pinout from the seat side:

Mystery connector pinout

1 Wht (heavier wire) - connects to pin7

2 Grn/org

3 Gy/Org

4 Blk

6 Blu/Red

7 Blu (heavier wire)

8 Not Connected

9 Gy/R

10 Wh/R

11 Not Connected

12 R

13 Not Connected

14 Not Connected

do you have any diagrams of a body harness that includes this connector?

 

Well I did a lot of reverse engineering, and I was able to conclude that the mystery connector is definitely related to seat motorization as it goes directly into the seat memory module (PSM). The seat does appear to operate properly without it connected with no DTCs from the PSM module. The vehicle it came from had it connected, but not sure where it was connected to. I fixed all of my motorization issues (now all seat memory functions work), but it was unrelated to this connector, so it’s still a complete mystery to me what this connector is used for???

Here are the pinouts I traced from all the seat connectors:

Mystery connector pinout (This is not anywhere in the vehicle electrical diagrams!)
————————————————-

1 Wht (heavier wire) - to C3449 (seat motor connector) Pin2 (shorter to pin7 in Seat controller)
2 Grn/org - to seat motor controller sensor connector pin20
3 Gy/Org - to seat motor controller sensor connector pin21
4 Brn - to seat motor controller sensor connector pin25
5 Blk - to seat motor controller sensor connector pin11
6 Blu/Red to seat motor controller sensor connector pin22
7 Blu (heavier wire) - to C3449 (seat motor connector) Pin2
8 Not Connected
9 Gy/R - to seat motor controller sensor connector pin9
10 Wh/R - to seat motor controller sensor connector pin 13
11 Not Connected
12 Red - to seat motor controller sensor connector
13 Not Connected
14 Not Connected

Connectors going into memory seat ECU (PSM) - 4 connectors total
————————————————-

C3449 (12pos dual row going into seat memory module) - motor outputs from seat memory module

1 Brown - headrest motor+
2 Blu - to mystery connector pin7
3 Blu/wht - rear height motor+
4 org/ylw - rear height motor-
5 wht - to mystery connector pin1
6 grn/wht - track slide motor-
7 grn - headrest motor-
8 wht/blk - recline motor+
9 brn/wht - recline motor-
10 ylw/grn - front height motor-
11 blk/grn - front height motor+
12 grn/blu- track slide motor+



C3448 16 pos connector going into seat memory module (only 3 used) - CAN/LIN data to vehicle and seat switch pack

8 red - LIN
15 wht - MS CAN+
16 ylw/blu - MS CAN-



C3447 26pos connector going into seat memory module - memory position sensors and “mystery connections”

1 Not Connected
2 Not Connected
3 Org - recline hall hall sensor
4 Blu - front tilt height hall sensor
5 Grn/Brn - rear height hall sensor
6 Not Connected
7 Blu/Org - headrest hall sensor
8 Brn/blu - track slide motor hall sensor
9 Gy/Red - To mystery connector pin 9
10 Not Connected
11 Not Connected
12 Blk - to Mystery connector Pin5
13 wht/Red - To mystery connector pin10
14 Not Connected
15 Not Connected
16 Not Connected
17 Not Connected
18 ylw/vio - recline/front height/headrest hall sensor ground
19 Not Connected
20 Grn/Org - to Mystery connector pin2 (rear height/slide hall sensor ground)
21 Gy/Org - to Mystery connector Pin3
22 Blu/Red - to Mystery connector Pin6
23 Not Connected
24 Not Connected
25 Brn - to Mystery connector pin4
26 Not Connected





C3450 14 pos heavy conductor black connector going into seat memory module - Power for seat motorization

1 Not Connected
3 Not Connected
5 Not Connected
7 Not Connected
9 Not Connected
11 Brn - Logic GND
13 Not Connected
2 Not Connected
4 Not Connected
6 Red - Power Feed 1 (30A fused)
8 Brn - Power GND 1
10 Brn - Power GND 2
12 ylw/red - Power Feed 2 (30A fused)
14 red/grn - Logic Power Feed (5A fused)





connectors into seat from vehicle
———————————————
C0751 (12 pos heavy wires)

1 red - Power Feed 1 (fused 30A)
2 ylw/red - Power Feed 2 (fused 30A)
3 Brn
4 Wht/Red
5 Brn
6 Wht/Red
7 Brn - Power GND 1
8 Not Connected
9 Brn - Logic GND
10 Wht/Grn
11 Grn/Org
12 Brn - Power GND 2

 

HI, were you ever able to work out the issue? I am staring a the same mystery plug (from an L322 2010) my RR is 2009, I’ve replaced my old seats, the only seat that doesn’t work is the drivers!!! My RR has 3 plugs, the new seat has 4! I’m scratching my head? Thinking of replacing the existing scruffy blue leather covers with the 2010 covers!